morganのformat拡張方法 ref: http://qiita.com/rymizuki@github/items/6b6686489a32d13df6c4

file0.js

var http   = require("http");
var express = require("express");
var morgan = require("morgan");

morgan.format("orig-format", "[:date] :method :url :status :response-time ms");

app = express();
app.use(morgan("orig-format"));
app.get("/", function (req, res) {
  res.send("Hello World\n");
});

http.createServer(app).listen(3000);

file1.txt

[Sat, 27 Sep 2014 10:23:23 GMT] GET / 200 100 ms